Most motorcycles have engine speed tachometers, as well as speedometers, as part of their instrumentation. What differences, if any, are there between the two in terms of transducers?
Find:
Explain the differences between tachometers and speedometers.
Analysis:
Frequency - engine speed is normally measured right at the crankshaft prior to any gearing in rpm - typically several thousands. The transducers used with speedometers measure speed at the axle in rpm - typically much lower than at the engine output.
Scale factors - the tachometer would require none, the speedometer requires a conversion factor from rpm of the axle (rotational) to mph (linear).
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